KarrimorIsla Ladies Weathertite, Women's Trekking & hiking shoes Trekking & hiking shoes

are these guarenteeds

Are these good on slippery surfaces?

Size-wise, l am 7.5, should l go up a half size or a full size? I want to wear ordinary socks, not thick ones

Do they have good grip on wet ground? I had some Karrimor trainers once (not walking shoes), and it felt like I was on ice when it rained.